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-rw-r--r--src/shared/cgroup-show.c354
1 files changed, 354 insertions, 0 deletions
diff --git a/src/shared/cgroup-show.c b/src/shared/cgroup-show.c
new file mode 100644
index 0000000..61df751
--- /dev/null
+++ b/src/shared/cgroup-show.c
@@ -0,0 +1,354 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <dirent.h>
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "alloc-util.h"
+#include "bus-error.h"
+#include "bus-util.h"
+#include "cgroup-show.h"
+#include "cgroup-util.h"
+#include "env-file.h"
+#include "fd-util.h"
+#include "format-util.h"
+#include "locale-util.h"
+#include "macro.h"
+#include "output-mode.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "string-util.h"
+#include "terminal-util.h"
+#include "unit-name.h"
+
+static void show_pid_array(
+ pid_t pids[],
+ unsigned n_pids,
+ const char *prefix,
+ unsigned n_columns,
+ bool extra,
+ bool more,
+ OutputFlags flags) {
+
+ unsigned i, j, pid_width;
+
+ if (n_pids == 0)
+ return;
+
+ typesafe_qsort(pids, n_pids, pid_compare_func);
+
+ /* Filter duplicates */
+ for (j = 0, i = 1; i < n_pids; i++) {
+ if (pids[i] == pids[j])
+ continue;
+ pids[++j] = pids[i];
+ }
+ n_pids = j + 1;
+ pid_width = DECIMAL_STR_WIDTH(pids[j]);
+
+ if (flags & OUTPUT_FULL_WIDTH)
+ n_columns = 0;
+ else {
+ if (n_columns > pid_width+2)
+ n_columns -= pid_width+2;
+ else
+ n_columns = 20;
+ }
+ for (i = 0; i < n_pids; i++) {
+ _cleanup_free_ char *t = NULL;
+
+ (void) get_process_cmdline(pids[i], n_columns, true, &t);
+
+ if (extra)
+ printf("%s%s ", prefix, special_glyph(SPECIAL_GLYPH_TRIANGULAR_BULLET));
+ else
+ printf("%s%s", prefix, special_glyph(((more || i < n_pids-1) ? SPECIAL_GLYPH_TREE_BRANCH : SPECIAL_GLYPH_TREE_RIGHT)));
+
+ printf("%*"PID_PRI" %s\n", pid_width, pids[i], strna(t));
+ }
+}
+
+static int show_cgroup_one_by_path(
+ const char *path,
+ const char *prefix,
+ unsigned n_columns,
+ bool more,
+ OutputFlags flags) {
+
+ char *fn;
+ _cleanup_fclose_ FILE *f = NULL;
+ size_t n = 0, n_allocated = 0;
+ _cleanup_free_ pid_t *pids = NULL;
+ _cleanup_free_ char *p = NULL;
+ pid_t pid;
+ int r;
+
+ r = cg_mangle_path(path, &p);
+ if (r < 0)
+ return r;
+
+ fn = strjoina(p, "/cgroup.procs");
+ f = fopen(fn, "re");
+ if (!f)
+ return -errno;
+
+ while ((r = cg_read_pid(f, &pid)) > 0) {
+
+ if (!(flags & OUTPUT_KERNEL_THREADS) && is_kernel_thread(pid) > 0)
+ continue;
+
+ if (!GREEDY_REALLOC(pids, n_allocated, n + 1))
+ return -ENOMEM;
+
+ assert(n < n_allocated);
+ pids[n++] = pid;
+ }
+
+ if (r < 0)
+ return r;
+
+ show_pid_array(pids, n, prefix, n_columns, false, more, flags);
+
+ return 0;
+}
+
+int show_cgroup_by_path(
+ const char *path,
+ const char *prefix,
+ unsigned n_columns,
+ OutputFlags flags) {
+
+ _cleanup_free_ char *fn = NULL, *p1 = NULL, *last = NULL, *p2 = NULL;
+ _cleanup_closedir_ DIR *d = NULL;
+ char *gn = NULL;
+ bool shown_pids = false;
+ int r;
+
+ assert(path);
+
+ if (n_columns <= 0)
+ n_columns = columns();
+
+ prefix = strempty(prefix);
+
+ r = cg_mangle_path(path, &fn);
+ if (r < 0)
+ return r;
+
+ d = opendir(fn);
+ if (!d)
+ return -errno;
+
+ while ((r = cg_read_subgroup(d, &gn)) > 0) {
+ _cleanup_free_ char *k = NULL;
+
+ k = strjoin(fn, "/", gn);
+ free(gn);
+ if (!k)
+ return -ENOMEM;
+
+ if (!(flags & OUTPUT_SHOW_ALL) && cg_is_empty_recursive(NULL, k) > 0)
+ continue;
+
+ if (!shown_pids) {
+ show_cgroup_one_by_path(path, prefix, n_columns, true, flags);
+ shown_pids = true;
+ }
+
+ if (last) {
+ printf("%s%s%s\n", prefix, special_glyph(SPECIAL_GLYPH_TREE_BRANCH), cg_unescape(basename(last)));
+
+ if (!p1) {
+ p1 = strappend(prefix, special_glyph(SPECIAL_GLYPH_TREE_VERTICAL));
+ if (!p1)
+ return -ENOMEM;
+ }
+
+ show_cgroup_by_path(last, p1, n_columns-2, flags);
+ free(last);
+ }
+
+ last = TAKE_PTR(k);
+ }
+
+ if (r < 0)
+ return r;
+
+ if (!shown_pids)
+ show_cgroup_one_by_path(path, prefix, n_columns, !!last, flags);
+
+ if (last) {
+ printf("%s%s%s\n", prefix, special_glyph(SPECIAL_GLYPH_TREE_RIGHT), cg_unescape(basename(last)));
+
+ if (!p2) {
+ p2 = strappend(prefix, " ");
+ if (!p2)
+ return -ENOMEM;
+ }
+
+ show_cgroup_by_path(last, p2, n_columns-2, flags);
+ }
+
+ return 0;
+}
+
+int show_cgroup(const char *controller,
+ const char *path,
+ const char *prefix,
+ unsigned n_columns,
+ OutputFlags flags) {
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ assert(path);
+
+ r = cg_get_path(controller, path, NULL, &p);
+ if (r < 0)
+ return r;
+
+ return show_cgroup_by_path(p, prefix, n_columns, flags);
+}
+
+static int show_extra_pids(
+ const char *controller,
+ const char *path,
+ const char *prefix,
+ unsigned n_columns,
+ const pid_t pids[],
+ unsigned n_pids,
+ OutputFlags flags) {
+
+ _cleanup_free_ pid_t *copy = NULL;
+ unsigned i, j;
+ int r;
+
+ assert(path);
+
+ if (n_pids <= 0)
+ return 0;
+
+ if (n_columns <= 0)
+ n_columns = columns();
+
+ prefix = strempty(prefix);
+
+ copy = new(pid_t, n_pids);
+ if (!copy)
+ return -ENOMEM;
+
+ for (i = 0, j = 0; i < n_pids; i++) {
+ _cleanup_free_ char *k = NULL;
+
+ r = cg_pid_get_path(controller, pids[i], &k);
+ if (r < 0)
+ return r;
+
+ if (path_startswith(k, path))
+ continue;
+
+ copy[j++] = pids[i];
+ }
+
+ show_pid_array(copy, j, prefix, n_columns, true, false, flags);
+
+ return 0;
+}
+
+int show_cgroup_and_extra(
+ const char *controller,
+ const char *path,
+ const char *prefix,
+ unsigned n_columns,
+ const pid_t extra_pids[],
+ unsigned n_extra_pids,
+ OutputFlags flags) {
+
+ int r;
+
+ assert(path);
+
+ r = show_cgroup(controller, path, prefix, n_columns, flags);
+ if (r < 0)
+ return r;
+
+ return show_extra_pids(controller, path, prefix, n_columns, extra_pids, n_extra_pids, flags);
+}
+
+int show_cgroup_get_unit_path_and_warn(
+ sd_bus *bus,
+ const char *unit,
+ char **ret) {
+
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_free_ char *path = NULL;
+ int r;
+
+ path = unit_dbus_path_from_name(unit);
+ if (!path)
+ return log_oom();
+
+ r = sd_bus_get_property_string(
+ bus,
+ "org.freedesktop.systemd1",
+ path,
+ unit_dbus_interface_from_name(unit),
+ "ControlGroup",
+ &error,
+ ret);
+ if (r < 0)
+ return log_error_errno(r, "Failed to query unit control group path: %s",
+ bus_error_message(&error, r));
+
+ return 0;
+}
+
+int show_cgroup_get_path_and_warn(
+ const char *machine,
+ const char *prefix,
+ char **ret) {
+
+ int r;
+ _cleanup_free_ char *root = NULL;
+
+ if (machine) {
+ _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+ _cleanup_free_ char *unit = NULL;
+ const char *m;
+
+ m = strjoina("/run/systemd/machines/", machine);
+ r = parse_env_file(NULL, m, "SCOPE", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to load machine data: %m");
+
+ r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL, false, &bus);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create bus connection: %m");
+
+ r = show_cgroup_get_unit_path_and_warn(bus, unit, &root);
+ if (r < 0)
+ return r;
+ } else {
+ r = cg_get_root_path(&root);
+ if (r == -ENOMEDIUM)
+ return log_error_errno(r, "Failed to get root control group path.\n"
+ "No cgroup filesystem mounted on /sys/fs/cgroup");
+ else if (r < 0)
+ return log_error_errno(r, "Failed to get root control group path: %m");
+ }
+
+ if (prefix) {
+ char *t;
+
+ t = strjoin(root, prefix);
+ if (!t)
+ return log_oom();
+
+ *ret = t;
+ } else
+ *ret = TAKE_PTR(root);
+
+ return 0;
+}
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